I have downloaded GoJs to a new folder from your website as well as GitHub and finally from GitHub to my Desktop. In 2 occasions Microsoft’s Unzip did not start and when downloaded from GitHub to the Desktop, the download failed and 2 errors were displayed: ffmpeg.dll and node.dll missing. Reinstall cleared node.dll but not ffmpeg.dll.
I cannot reproduce the problem with either the site.zip file that we created or the GoJS-master.zip file that GitHub creates automatically for you to download.
Try it on another system or with other ZIP files.
Will try again on Sunday. Thanks for getting back to me so quickly. John